Browse Prior Art Database

High Current Feed Through Filter System

IP.com Disclosure Number: IPCOM000091881D
Original Publication Date: 1968-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cielo, JR: AUTHOR

Abstract

Compact electrical filter 10 is used in high-current circuits for the suppression of common noise and as a high current feed-through in an RF interference shield 12. Filter 10 is disposed in shield 12 so as to form a feed-through for outgoing and return conductors 14 and 16 by which power is fed from power supply 18 to load 20.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 96% of the total text.

Page 1 of 2

High Current Feed Through Filter System

Compact electrical filter 10 is used in high-current circuits for the suppression of common noise and as a high current feed-through in an RF interference shield 12. Filter 10 is disposed in shield 12 so as to form a feed- through for outgoing and return conductors 14 and 16 by which power is fed from power supply 18 to load 20.

Supply 18 is shown as a combination of battery 22 having leads connected to the conductors 14 and 16 and noise source 30 inducing undesirable high- frequency signals to the battery circuit by antenna 32. Load 20 comprises resistor 34 connected by leads 36 and 38 to conductors 14 and 16. Source 30 and resistor 34 connect to grounds 44 and 42. Filter 10 comprises a cylinder of ferrite material 62 and 64 included in cylindrical conductive sheath 50 by which the device is mounted in shield 12 by welds 58 and 60.

Noise source 30 is grounded so that common mode noise signals 46, set up by noise source signal 48, tend to flow in conductor 14 through resistor and back through ground as indicated by 48. Shield 12, which is grounded as indicated by 70, intercepts the radiated or induced noise between supply 18 and load 20 and also provides a conductive path from sheath 50 for a return circuit as indicated by 72 and 74 for the noise signals which are blocked by the equivalent inductance of the filter. Thus, the filter and shield cooperate to reduce noise signal 48 through load 20 to an acceptable value.

1

Page...